Cyclization of .ALPHA.- and .BETA.-alkylthio-substituted amines possessing positively charged carbon at the nitrogen. A new synthetic method for thiazolidines, thiomorpholines and dihydro-1,4-benzothiazines.
Cyclization of .ALPHA.- and .BETA.-alkylthio-substituted amines possessing positively charged carbon at the nitrogen. A new synthetic method for thiazolidines, thiomorpholines and dihydro-1,4-benzothiazines.
o-Benzenedisulfonimide has been used to efficientlycatalyse the reaction between 2-aminothiophenol, 2-aminophenol, o-phenylenediamine and various ortho esters (28 examples; average yield 90%) or aldehydes (17 examples; average yield 72%) giving the corresponding benzofused azoles in excellent yields. Reaction conditions were very simple. In addition, other carboxylic acid derivatives have been tested
Bag; De; Das, Indian Journal of Chemistry - Section B Organic and Medicinal Chemistry, 1997, vol. 36, # 3, p. 232 - 235
作者:Bag、De、Das、Sinha
DOI:——
日期:——
Cyclization of .ALPHA.- and .BETA.-alkylthio-substituted amines possessing positively charged carbon at the nitrogen. A new synthetic method for thiazolidines, thiomorpholines and dihydro-1,4-benzothiazines.
The present paper describes the finding that α- and β-alkylthio-substituted amines possessing a positively charged carbon such as =CHPh, CO2R and CH2SR at the nitrogen undergo cyclization in the presence of lithium diisopropylamide or sodium hydride leading to thiazolidines, thiomorpholines and dihydro-1, 4-benzothiazines.